I chiseled an 8" vertical and 48" horizontal hole through the bathroom tile, concrete, and lath a few days ago. Plumber came today and cut away the return pipe and 90* knuckles. He replaced the return pipe and knuckles with PVC along with pitching it just a little better than the old pipe. I then cut cement board to fit and secured it place this afternoon. Tomorrow I will buy tile mastic and adhere the tile to the cement board.....I actually found enough extra color-correct tile stored in my cellar. Saturday will be grout day.